Re: axis 2100 cam refuses to work on 12v DC

mpm wrote:

On Mar 23, 9:32�pm, "Michael A. Terrell" <mike.terr...@xxxxxxxxxxxxx>
wrote:

Wrong. A lot of those AC powered cameras have an internal power
transformer and use a 12 VAC input to allow them to be classed as a "Low
Voltage Device" which does not require the wiring to be installed by an
electrician.

Mike,
Are you referring to NEC Code here?
Because wouldn't 12vdc ALSO be considered a low voltage device??
I don't have the codebook in front of me, but I thought the cutoff was
50volts (DC or AC, makes no difference??)

I would think it more likely they're just saving costs.
A typical DC wall wart cost more than a similar power AC style.
By many dollars in most cases.

-mpm


You don't get as much isolation for multiple cameras with a common DC
source, but a number of cameras can run from the same AC source with no
ground loops. Yes, a super cheap camera that is not made for multiple
camera installations can get away with a really crappy wall wart, but
some of the security cameras are still made for AC operation, to replace
failing vidicon cameras without rewiring. If the camera calls for AC,
that's what it needs.

Low voltage is typically in the 24 volt, or less range for AC. it is
also referred to as "Class 2" wiring. Sound systems with 25 volt line
output are just barely "Class 2".

--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida
.

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